Chain for mining-machines.



c. E. DAVIS, CHAIN FOR MININGMACHINES.

APPLICATION FILIED MAY 29. 1914.

Pzmnmd Dec, 11, 191?.

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Specification ofLetters Patent.

Patented Dec. ft, 19M.

Application filed May as, 191a. Serial to. server.

To all whom it mayconaemr I I Be'it known that 1, CHA LES E. DAVIS, a citizen of the United States, residing at Chicago, in the county of Cook and State of Tllinois, have invented a certain new and useful Improvement in- Chains for Mining- Machines, of which the following is a specification.

This invention relates to chains for mining machines and has for its object to pro improved device of this description. v

The invention is illustrated in the accompanying drawings, whereinllli Figure l is a plan view of a portion of a cutter chain for mining machines, embodying the invention;

Fig. 2 is a view of one of the chain straps Fig. 3 is a side elevation showing two of the chain straps in their assembled position; Fig. 4f is an enlarged sectional view taken on line 4-4: of Fig. 1, showing the chain in position in the guide along which it travels.

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like numerals refer to like parts throughout the several figures.

In the construction shown I have illustrated a cutter chain for mining machines which is made up of a series of blocks 1, containing cutters 2, said blocks being connected' together by the chain straps 3, the blocks being pivotally connected with the chain straps so as to form a flexible chain. There are two straps 3 connecting adjacent blocks, one strap connected above and theother below as shown in Figs. 3 and 4.

These straps are provided at each end with openings 4 and with projecting lugs 5 surrounding said openings, the two straps being connected together by the pins or rivets 6 to' form a link, the blocks together by a series of these .links.

The blocks l are provided with openings into whichthe lugs 5 project, the rivets 6 passing through the straps so as to fasten them to the blocks. Therear faces of the straps are provided withthe projecting ribs 7 and the rear-portion of the blocks are provided with the projecting ribs 8. The guide for the chain maybe made in any desired manner. As herein shown it consists of a frame piece 9 having the projecting parts 10 separated by a space, a portion of the chain being received into this space, the outer edges of the straps and blocks projecting bemg connected ing parts 10 are provided with grooves 11 for the ribs 7 and 8. The outer edges of the straps are also provided with projecting ribs 12, which are on the portions of the straps which project beyond the guide. The inner faces of these ribs are preferably separated from the outer faces of the rojecting parts or pieces 10 so that they will not engage said pieces and said ribs strengthen the straps so as to prevent their breaking.

The cutter chain is an endless chain and passes around suitable sprocket wheels. It will be noted that some of the cutters 2 are inclined so as to be at an angle, as shown in Fig. 4. When these cutters are cutting the coal there is a severe strain on the chain and there is produced two twisting actions, one in a vertical plane and the other in a horizontal plane. The strains on the chain links are therefore very severe and there is a tendency for these links to break between the points where the pins 6 pass therethrough. It will further be noted that the ribs 12 extend along the outer edges of said be varied, and I therefore do not "limit myself to the particular construction shown.

I claim.-

1. A cutter chain for mining machines comprising; a series of chain blocks, and a series of chain straps connecting saidblocks, each strap provided with two ribs'atthe opposite edges thereof. 4 a

2. A cutter chain for mining machines comprising a series of chain blocks having holes therethrough, a series of chain straps having holes therethrough, pins passing through said holes and pivotally connecting said straps and blocks together, two projecting ribs on each of said straps, said ribs being located at the opposite edges thereof.

3. A. cutter chain for mining machines comprising a series of chain blocks having holes therethrough, a series of chain straps having holes therethrough, pins passing threugh said holes and pivotally connecting said straps and 'blocks together, two projecting ribs on each of said straps, said ribs being located at the opposite edges thereof, the ribs on the outer edges projecting at points opposite the holes in said straps.

4. A cutter chain strap for mining machines provided with two separated projecting ribs'at the opposite edges thereof.

5. A cutter chain strap for mining machines provided with two separated projecting ribs at the opposite edges thereof, the rib on the one edge being longer than the rib on the other edge.

6. A cutter chain for, mining machines comprising a series of chain blocks and chain straps connecting said blocks, the straps and blocks pivotally connected together, a guide in which said chain works, ribs on the rear edges of said blocks adapted to project into grooves in said guide, the outer edges of said straps projecting beyond said guide, and projecting ribs on the faces of said straps,

said ribs designed to run outside of said guide.

7 'A cutter machine for mining chains comprising a series of chain blocks, links pivotally connecting said blocks together each link made up of two straps, guiding ri s on the rear edges of said straps and strengthening ribs on the outer edges of said straps having portions opposite the pivotal points thereof, said strengthening ribs projecting substantially at right angles to the plane of the body of said straps and strengthening said links to resist the stresses due to the angular positions of said cutters.

In testimony whereof, I aflix my signature in the presence of two witnesses this 21st day ,of May 1914.

CHARLES E. DAVIS.

Witnesses:

GENEVA Hm'rn, L. M. EISZNEB. 

